A third one:

> Perl programs are easy to write and fast to develop. The interpreter doesn't require you to declare all your function prototypes and data types in advance, new variables spring into existence as needed, calls to undefined functions only cause an error when the function is needed. The debugger works well with Emacs and allows a comfortable interactive style of development.

I think each and every language that could undo this second "billion dollar mistake", did ("strict mode").